Core VID

[Rolfi]

Mam GF 6600GT AGP.
Chcel by som vediet ci je to normalne ked mi v RivaTuneri Core VIP klesne na nula volt akonahle je teplota Core nisia ako 37 stupnov.

[Rolfi]

OBR:

http://pipino.webpark.sk/riva.jpg
Ked nezobrazi dajte refresh

[Ruka]

Niezrobil, ani po refresu.

Rolfi, to nieje "volt" jako "V", ale jakasi nVIDIA-cka jednotka, kera neudava volty, alenejaky jiny humus, ktery uz me davno nezajima, protoze s tim nic udelat nejde. To, ze se dostane na nulu asi znamena usporny rezim jedra, urcite to jede ve 2D rezimu a mj., to je dost nizka teplota, na 6600GT.

[Thellwin]

Toto je vyjádření samotného Unwindera na http://forums.guru3d.com ohledně Core VID, kdo chce at se tím prokouše

Q: There are a lot of rumors about GeForceFX software voldmods on the net. I've seen some online BIOS voltmodding tutorials and even volmodded BIOSes available for download. Can you comment it?
A: Yes, GPU core voltage is really software controllable on GeForce FX graphics processors. Unfortunately, all online BIOS voltmodding guides I've seen seem to be written using blind comparison of different BIOS binaries without actual understanding of software voltage control internals. So they contain some logical errors. The same applies to some voltmodded BIOSes available for download on some websites.
To understand internals of software voltage control, let's start from the very beginning. NVIDIA boards have some GPU controllable GPIO (General Purpose Input Output) pins, which are used for different purposes. Up to three of these pins can be used to control core voltage on GeForce FX based boards. The states of this pins form binary word (up to three bits width), which uniquely identify target core voltage. This word is called VID, or voltage identifier. So to program desired core voltage driver simply sets each pin to the corresponding state via the corresponding GPIO register. But VID interpretation entirely depends on the PCB's core voltage generation logic, for example most of NV35/38 boards control core voltage via ISL6569 IC, where its' VID0 and VID1 input pins are hardwired to 0 / 1, and VID2 - VID4 pins are programmable by GPU. So core voltage on these boards can be adjusted in 0.8 - 1.5V range with 0.1V granularity and all three GPIO pins are used. Other boards may have (and do have) simpler voltage control logic (e.g. simplest 1-bit VID selecting one of 2 predefined voltages). As I've said before, VID interpretation may differ depending on the PCB design, and driver knows nothing about it. To allow hardware vendors to alter voltage control logic safely, NVIDIA introduced so called voltage tables in BIOS with BMP structure version 5.25 and newer. For older BIOSes driver uses its' own GPU-specific internal voltage table. Voltage table begins from the header, containing total amount of voltage entries, size of each entry and valid VID bitmask. The last field is the most important, because it 'tells' the driver which pins actually control the voltage. For example, nobody prevents hardware vendor from using 2-bit VID defined by pin 0 and pin 2. In this case VID bitmask will contain 101b. Take a note, that the driver will never program masked pins. Array of voltage table entries follows by the header. Each voltage table entry contains target voltage identifier (target voltage (in Volts) * 100) and VID defining this voltage. The first element of each entry (i.e. target voltage identifier) is used just to allow the driver to pick the corresponding VID from the table (because the driver knows nothing about VID, it knows just the target voltage picked from the corresponding performance level entry in the performance table). So when programming the voltage, the driver simply picks required voltage entry from the table by scanning all voltage table entries, comparing target voltage identifier with voltage identifier of each entry and selecting the closest entry. When the entry is selected, the driver disassembles VID on separate bits, and programs each non-masked bit via the corresponding GPIO register.
If you've read all this info carefully, you may already see logical errors and potential problems in currently walking voltmodded BIOS yourself:
First, it's plain wrong to voltmod BIOS by copying 1.5V VID from NV38's voltage table to all other BIOSes without seeing the PCB and its' voltage control logic as it is advised in BIOS voltmod tutorials. VIDs do not have to be the same on all boards.
Second, it's wrong to ignore VID bitmask and to edit voltage table entry's VID only. As an example, let's take a board with the following 2-bit VID:
00 -> 1.1V, 01 -> 1.2V, 02 -> 1.3V and 03 -> 1.4V. Attempt to boost voltage by increasing VID to 4 will actually lower voltage and result in setting 1.1V (4 & 3 = 0). Attempt to boost voltage by copying NV38's 1.5V VID (7) will simply do nothing (7 & 3 = 3). The same attempt on the board with different 2-bit VID interpretation (e.g. 01 -> 1.4V, 02 -> 1.3V, 03 -> 1.2V) will also lower voltage and set it to 1.2V. So if you can actually see the PCB and are sure that there are more than 2 bits in VID - you've to change VID mask too. Otherwise, you simply shouldn't touch it.
To help you to see if your voltmodded BIOS really affects VIDs, RivaTuner gives you an ability to monitor state of voltage related GPIO pins in realtime, so you may see which VID is currently programmed by the driver. Using RivaTuner's VID interpretation feature you may also see both raw VID data and target voltage corresponding to this VID (to select VID interpretation mode right-click VID graph in the hardware monitoring window, select Setup from the context menu and press More button). Furthermore, RivaTuner's diagnostic report module allows you to see internals of voltage table stored in VGA BIOS and warns you if there are some entries with invalid VIDs, which don't conform to VID bitmask.

[alea206]

CoreVid máš obvykle 1;2;3
1 - znamená 2D režim
2 - low3D režim (spouští se jako ochrana proti přetížení GPU)
3 - Performance3D (spouští se standartně při 3D aplikacích)

Ten tvuj CoreVid je nějakej pochybnej měl by bejt jedna a jak ti nahoře na chvíli skočila frekvence nahoru tak tam by měl bejt 3

Dej si tam oficiální WHQL ovladače a pokud to bude dělat zase je to divný.
Odpovídá ti výkon třeba v 3DMarku05 výsledkům z internetovejch testů?

[Rolfi]

Ovladace mam aktualne WHQL.
3DMark05 okolo 3300 b. 500/900
Ono to ani nerobi problemi,len niekedy mi vyskoci hlaska ze nemam dostatocne napajanie a frekvencie sa znizia.
To z Core VID som si vsimol az po vymene org. chladica za PRIMECOOLER AlCu.
Ale mam taky pocit ze to Core VID klesa na nulu iba v rozpeti teplot jadra. Medzi 33 az 37 stupnov je nula.
Ale teraz som cital ze to taky problem maju aj iny
http://forum.pctuning.cz/viewtopic.php?t=59715

[LGA]

No jak mam CoreVID stale 7. A by byl nejaky problem se me nezda. GK mam Gigabyte 6600 256MB DDR2

[alea206]

Ty jo, mě se coreVID 7 povedlo jenom když sem do FX5900XT dal BIOS z FX5950

[Rolfi]

Mne to na 7micku skoci akonahle sa spusti 3D rezim.